Idaea fuscovenosa
Graurandiger dwarf tensioner ( idaea fuscovenosa )
The Graurandige dwarf tensioner ( fuscovenosa idaea ), also known as bush or scrub floor hallway tensioner tensioner Klein, is a butterfly (moth ) from the family of the tensioner ( Geometridae ).
Features
The moths have a wingspan of 14-19 millimeters. The forewings are relatively wide, the posterior margin of the hind wing is slightly concave between the central veins. The basic color is white to light brown. The Costalrand may correspond to the color, but is more common gray brown on the wurzelwärtigen half. The inner and outer cross line are usually made very clear that the binding agent is washed out, and little wider, as well as the wavy line. Inner and outer transverse line and the median fillet end on Costalrand in clearly distinct black spots. The Diskalflecke are black and almost always present on the front and rear wings. On the front wings they are in the middle or slightly apical binding of the binding agent. On the hind wings the other hand, they are clearly root downward offset from the center binding. Frequently also Saumflecke are available.
The egg is initially bright red and is just before the hatching of the Eiraupen bright red. It is flattened at both ends, the outer side is provided with a regular grid pattern.
The caterpillar is provided black and brown with yellow or ocher spots. It is relatively short and is toward the front end a little thinner. It has significant constrictions and lateral keels. The back line is light brown and dark surrounds the rear. The middle segments are of rhomboid spots. The ventral side shows, however, in rows arranged, crescent-shaped, light brown spots.
The pupa is reddish brown and has greenish elytra on. The segment cuts, however, are dyed a little darker, as the cremaster.
Geographical distribution and habitat
The species is widespread in central and southern Europe. But it is usually not common and in Central Europe, the deposits are usually small and scattered. In the north, the range extends to England and Ireland, Denmark, southern Sweden and the southern Baltic; in the west of the Iberian Peninsula to Asia Minor, the Ukraine, South Russia and the Caucasus region. It also occurs on the large Mediterranean islands of Corsica, Sardinia and Sicily. In Corsica, the Nominatunterart is represented by the subspecies corsula damage Werda, 1929. Earlier reports from North Africa are assigned the type idaea bigladiata today. In the north of the range of height, the species occurs from sea level up in front of about 500 meters. In the Southern Alps, it rises to 1000 meters altitude, in Corsica until at 2000 meters altitude. The species is xerothermophil, ie it prefers dry and warm habitats. In the north of its range it is usually confined to sun-exposed hedgerows, dry forests and forest edges, grasslands with lots of moss, gardens or uncultivated land.
Phenology and life
The species is univoltine, meaning it only one generation a year is formed. The moths fly from mid-June to mid-August. They rest during the day in hedges and grass and can be easily disturbed. They are nocturnal and are attracted by artificial light sources. The caterpillars feed on various trees and shrubs as well as herbaceous plants and mosses, where they prefer dead leaves and wilted plant material. Proved are oak (Quercus ) and Rhytidiadelphus triquetrus ( Large wreath moss ). But in the breed they also eat dry leaves of blackthorn (Prunus spinosa), field - pimpernel ( Anagallis arvensis), dandelion (Taraxacum officinale), blackberry (Rubus fruticosus agg. ), Smartweed ( Polygonum aviculare ), Labkräuter ( Galium ), sorrel ( Rumex ), thyme (Thymus ), garden salad ( Lactuca sativa), willow ( Salix) and Yarrow (Achillea millefolium ) The caterpillars grow very slowly and hibernate. They pupate in May of the following year.
System
The species was described by Johann August Ephraim Goeze 1781 under the name Phalaena Geometra fuscovenosa first time scientifically. Some misspellings in the literature (eg fusciovenosa and fuscovenosata ) are not available for the purposes of zoological nomenclature ( nomina nulla = " non- name ").
Endangering
The species is regarded in Germany as not at risk. Only the city-state of Hamburg recorded the species in Category 2 ( high risk ), the Saarland in Category 3 (endangered ). In Bavaria and Lower Saxony, the species is classified as Near Threatened, should further habitat destruction continues.